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Author:

Liu, Chenguang (Liu, Chenguang.) | Zhao, Yinchao (Zhao, Yinchao.) | Yi, Ruowei (Yi, Ruowei.) | Wu, Hao (Wu, Hao.) | Yang, Wenbin (Yang, Wenbin.) | Li, Yinqing (Li, Yinqing.) | Mitrovic, Ivona (Mitrovic, Ivona.) | Taylor, Stephen (Taylor, Stephen.) | Chalker, Paul (Chalker, Paul.) | Liu, Rui (Liu, Rui.) | Yang, Li (Yang, Li.) | Zhao, Cezhou (Zhao, Cezhou.)

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Abstract:

Here, we demonstrate a facile method to synthesize an amorphous GeOx-coated MXene nanosheet structure as the anode in lithium-ion batteries. By using the GeO32− as the precursor, NaBH4 as the reduction agent, we performed a one-pot in situ synthesis to prepare a composite of GeOx nanoparticles coated on MXene nanosheet. The size of the GeOx nanoparticles is approximately 50 nm, which offers abundant contact surface between active materials with the electrolyte, as well as fast pathways for Li-ion interaction. Moreover, the unique two-dimensional MXene nanosheet serves as the excellent conductive additives to improve the electrochemical stability and electrical conductivity of composite when used in LIBs. The results indicate that the GeOx/MXene nanosheet structure significantly improves the stability during the lithiation/delithiation processes, with the enhanced capacity through an improved kinetic process. Another attractive element of this novel anode is the flexibility to tune the electrochemical properties by using different combination of binder and solvent when the slurry is prepared for the electrode fabrication. The electrode prepared with polyvinylidene fluoride binder and N-methyl pyrrolidinone solvent exhibits an excellent sustainable capacity of 381 mAh g−1 at 15 A g−1. By contrast, the electrode with lithium polyacrylate and de-ionized water delivers a reversible capacity of 950 mAh g−1 at 0.5 A g−1 after 100 cycles. These interesting results are ascribed to the inner characteristic structure of the two types of electrodes, which have been verified by electrochemical kinetics and scanning electron microscopic images. It also reveals that the different dispersion state is responsible to the difference of electrochemical properties, which highlights the importance of the electrode design for high-performance lithium-ion batteries. © 2020

Keyword:

Additives Anodes Electrochemical electrodes Electrochemical properties Electrolytes Fluorine compounds Germanium compounds Ions Lithium-ion batteries Nanoparticles Nanosheets Sodium Borohydride Synthesis (chemical)

Author Community:

  • [ 1 ] [Liu, Chenguang]Department of Electrical and Electronic Engineering, Xi'an Jiaotong-Liverpool University, Suzhou; 215123, China
  • [ 2 ] [Liu, Chenguang]Department of Electrical Engineering and Electronics, University of Liverpool, Liverpool; L69 3GJ, United Kingdom
  • [ 3 ] [Zhao, Yinchao]Department of Electrical and Electronic Engineering, Xi'an Jiaotong-Liverpool University, Suzhou; 215123, China
  • [ 4 ] [Zhao, Yinchao]Department of Electrical Engineering and Electronics, University of Liverpool, Liverpool; L69 3GJ, United Kingdom
  • [ 5 ] [Yi, Ruowei]Department of Chemistry, Xi'an Jiaotong-Liverpool University, Suzhou; Jiangsu; 215123, China
  • [ 6 ] [Yi, Ruowei]Department of Chemistry, Stephenson Institute for Renewable Energy, University of Liverpool, Liverpool; L69 7ZD, United Kingdom
  • [ 7 ] [Wu, Hao]Department of Electrical and Electronic Engineering, Xi'an Jiaotong-Liverpool University, Suzhou; 215123, China
  • [ 8 ] [Yang, Wenbin]Department of Electrical and Electronic Engineering, Xi'an Jiaotong-Liverpool University, Suzhou; 215123, China
  • [ 9 ] [Li, Yinqing]Dongguan Hongde Battery Ltd. Co., Dongguan; 523649, China
  • [ 10 ] [Mitrovic, Ivona]Department of Electrical Engineering and Electronics, University of Liverpool, Liverpool; L69 3GJ, United Kingdom
  • [ 11 ] [Taylor, Stephen]Department of Electrical Engineering and Electronics, University of Liverpool, Liverpool; L69 3GJ, United Kingdom
  • [ 12 ] [Chalker, Paul]Centre for Advanced Materials, University of Liverpool, L69 3GH, United Kingdom
  • [ 13 ] [Liu, Rui]National Demonstration Center for Experimental Materials Science and Engineering Education, Jiangsu University of Science and Technology, Zhenjiang; 212003, China
  • [ 14 ] [Yang, Li]Department of Chemistry, Xi'an Jiaotong-Liverpool University, Suzhou; Jiangsu; 215123, China
  • [ 15 ] [Zhao, Cezhou]Department of Electrical and Electronic Engineering, Xi'an Jiaotong-Liverpool University, Suzhou; 215123, China

Reprint Author's Address:

  • [Yang, Li]Department of Chemistry, Xi'an Jiaotong-Liverpool University, Suzhou; Jiangsu; 215123, China;;

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Source :

Electrochimica Acta

ISSN: 0013-4686

Year: 2020

Volume: 358

6 . 9 0 1

JCR@2020

6 . 9 0 1

JCR@2020

ESI Discipline: CHEMISTRY;

ESI HC Threshold:70

CAS Journal Grade:2

Cited Count:

WoS CC Cited Count: 0

SCOPUS Cited Count: 14

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 2

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